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为研究探测器立体角在X射线荧光(X-ray fluorescence,XRF)分析仪的设计对测量结果的影响,运用蒙特卡罗方法对XRF仪进行建模。结果表明,探测器脉冲计数随着探测器与样品之间距离的增大指数衰减;随着探测器立体角的增大,特征峰计数非线性增大,源峰探测效率指数递减;探测器本征探测效率与探测器立体角无关。本文研究方法和结论可为一些XRF仪的设计提供参考。
To study the influence of the detector solid angle on the measurement results of the X-ray fluorescence (XRF) analyzer design, the XRF instrument was modeled using a Monte Carlo method. The results show that the pulse count of the detector decays exponentially with the distance between the detector and the sample increasing. As the solid angle of the detector increases, the characteristic peak count increases nonlinearly and the detection efficiency index of the source peak decreases. Probe detection efficiency has nothing to do with the solid angle detector. The research methods and conclusions in this paper can provide some references for the design of some XRF instruments.